Call Now! (309) 787-4971

STS Bearing Isolator

Gearboxes with flooded shafts are some of the most difficult applications to seal. Due to the flooded conditions, oil will leak through a non-contacting seal into the atmosphere. However, contact seals lose effectiveness in a short period of time due to wear, and purged seals can be expensive to purchase and maintain.

The Inpro/Seal STS Bearing Isolator effectively seals gearboxes with flooded shafts through innovative design and technology. A two-part dynamic seal consisting of a rotor and stator, the STS Bearing Isolator combines a contact seal with the patented XX Interface to eliminate contamination ingress and lubrication loss. To increase seal life expectancy, the contact seal rides on a ground stainless steel rotor that replicates the shaft surface, decreasing wear.

The STS Bearing Isolator can be custom engineered to meet requirements of your gearbox and operating environment.

Watch the Video Request a Quote Find a Rep Download Literature

  • XX Interface: unique stator/rotor interface provides permanent protection against contamination ingress
  • Contact seal: creates a barrier on the rotor to block lubrication from escaping into atmosphere
  • Rotor: ground stainless steel rotor that decreases contact seal wear
  • Standard Material: Bearing Bronze, 416 Stainless Steel
  • Axial Movement: 0.13 mm (0.005")
  • Radial Movement: 0.38 mm (0.015")
  • Temperature Range-26°C (-15°F) to 121°C (250°F)
  • Speed: 10,000 rpm
  • Shaft Size: 15.88 mm (0.625") to 381 mm (15")


Consult an Inpro/Seal representative for operating conditions outside of limits shown.